Postgres 16

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 create table Prix (rank integer primary key, value bigint unique);

CREATE TABLE


create table Pris (rank integer primary key, value bigint unique);

CREATE TABLE


INSERT INTO Prix
    ("rank", "value")
VALUES
    (1, 1229),
    (2, 1993)
;

INSERT 0 2


INSERT INTO Pris
    ("rank", "value")
VALUES
    (1, 2719),
    (2, 3547)
;

INSERT 0 2


INSERT INTO Prix 
  SELECT 
  ROW_NUMBER() OVER(ORDER BY "rank") + ( SELECT MAX("rank") FROM Prix),
  "value"
  FROM Pris ON CONFLICT  DO NOTHING;

INSERT 0 2


SELECT * FROM Prix


rank
value


1
1229

2
1993

3
2719

4
3547



SELECT 4